id:A101036 - OEIS Search Results

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Weasel numbers: Riesel numbers (n such that n*2^k - 1 is composite for all k >= 1), under the unproved assumption that a Riesel number can be certified by finding a periodic sequence p of prime divisors with p(k) | n*2^k-1.

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509203, 762701, 777149, 790841, 992077, 1106681, 1247173, 1254341, 1330207, 1330319, 1715053, 1730653, 1730681, 1744117, 1830187, 1976473, 2136283, 2251349, 2313487, 2344211, 2554843, 2924861, 3079469, 3177553, 3292241, 3419789, 3423373, 3580901 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`David W. Wilson, Table of n, a(n) for n = 1..89`
	CROSSREFS	`See A076337 for references and additional information. Cf. A076336.` `Sequence in context: A157759 A124945 A076337 this_sequence A123321 A147574 A046325` `Adjacent sequences: A101033 A101034 A101035 this_sequence A101037 A101038 A101039`
	KEYWORD	`nonn`
	AUTHOR	`David W. Wilson (davidwwilson(AT)comcast.net), Jan 17 2005`
	EXTENSIONS	`As far as 3292241, checked by Don Reble (djr(AT)nk.ca), Jan 17 2005, who comments that up to this point each n*2^k-1 has a prime factor <= 241.`

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Last modified November 25 13:47 EST 2009. Contains 167481 sequences.

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